JPH0770880B2 - Terminal pin insertion quality detection method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Outline] A method for detecting the quality of insertion of a terminal pin when mounting an electronic component having a large number of terminal pins in a pin hole of a printed circuit board, regardless of the arrangement configuration of the terminal pin For the purpose of making it possible to quickly judge the quality of insertion of terminal pins, register the expected number of terminal pins of all the elements in advance,
It is configured to include the presence or absence of a pin inserted in the corresponding pin hole of the printed board, and to compare the total number with the registered pin number.

[Industrial application field]

The present invention relates to a terminal pin insertion automatic test method useful when automatically inserting an electronic component such as an IC into a printed board.

There are roughly two types of terminal pin layouts in which the terminal pins (leads) project from both sides of the IC package: the DIP type and the ZIP type. In the former, the terminal pins (leads) project symmetrically from both sides of the IC package like crab legs, whereas in the latter, the terminal pins project alternately from the bottom of the IC package to both sides.

The present invention can be applied regardless of the arrangement configuration of such terminal pins.

[Conventional technology and problems to be solved]

In the automatic IC insertion process of automatically inserting the IC into the printed board, it is necessary to check whether the leads (terminal pins) of the IC are correctly inserted into the corresponding pin holes of the printed board.

Most of the conventional confirmation work is a visual inspection by an operator.

Also, some automatic testers are in practical use, but none of them can be shared with the above-mentioned DIP type and ZIP type (or rather, the ZIP type has not been subjected to automatic testing) and can be checked. There is a problem that the number of terminal pins is limited, and further, when the terminal pins are mounted in a phase-shifted state, it is not possible to confirm this "shift".

These problems not only reduce the reliability of the confirmation work, but also hinder the rapid processing of the insertion inspection.

An object of the present invention is to solve such a problem, and provide a method for detecting the quality of insertion of a terminal pin, which has versatility and can reliably and quickly determine the quality of insertion of a terminal pin regardless of the arrangement configuration of the terminal pin. To do.

[Means for Solving the Problems]

In order to achieve the above object, according to the present invention, when a large number of terminal pins of an element are inserted into corresponding pin holes of a printed board, whether or not the insertion is correctly detected is detected. The method is to register the expected number of terminal pins of the device in advance, detect the presence or absence of pins inserted in the corresponding pin holes of the printed board, compare the total number with the number of registered pins above, and With the configuration that the total number of detection matches with any of the number of registered pins and after that, when the terminal pin “absent” is detected even number of times in succession, the normal test of the normal device is completed when it is not zero mounting. It is a feature of.

[Work]

The number of inserted terminal pins is detected by, for example, an optical sensor. The total number of detected pins is compared with the number of pins registered in advance, and if they do not match, an error is generated.
Only normal if they match. Since they are compared by the total number, they are detected regardless of the type of terminal pin or the arrangement. Further, since the specific numerical value of the total number of pins itself is not detected (though it can be detected), only whether or not it matches the registered number is detected, so that the processing is performed quickly.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an example of a specific configuration for optically detecting the presence or absence of a terminal pin.

Figure 1 shows the terminal pins 1 protruding from both sides of the IC package 11.
The state where 3, 13 are inserted into the corresponding pin holes 17, 17 of the printed board 15 is shown. The simplest method of detecting the presence or absence of a terminal pin is an optical method (but not limited to it), and a reflection type fiber sensor 21, 21 having a pair of light emitting element and light receiving element, for example, is provided below the printed board 15. Is provided and the optical path can be easily detected by blocking the terminal pin.

According to this method, it is possible to reliably detect whether or not the pin is in the pin hole, regardless of the pin arrangement or type.

FIG. 2 is a plan view showing an example (DIP type) of an arrangement of terminal pins.

Attach serial numbers to the terminal pins as shown. That is, assuming that there are n terminal pins on one side of the IC package 11, numbering 1 to n from one end on one side (left side in the illustrated embodiment),
On the other side (the right side in the illustrated embodiment), starting from the terminal pin located on the opposite side of the nth, the numbers from n to (n + n) are added to the other end.

The number of terminal pins of an IC is various, but it is generally determined according to its application. For example, 8, 14, 16, 18, 20, 2
2, 24, 28, 40, 42, 64. All the numbers of these pins are registered in the memory in advance. In the present invention, as will be described later, even when there is no terminal pin (when 0) is detected, 0 (zero) is also registered as one of the above pin numbers.

Detection begins with the terminal pins towards the nth and (n + 1) th pins.

The method of the present invention will be described below with reference to the flowchart shown in FIG.

First, in step 301, a delay is given for an arbitrary time until the element is automatically inserted and the terminal pin can be detected. Next, in step 303, regardless of the number of terminal pins of the device, as described above, from the one end of the IC package, the nth pin → (n + 1) th pin → (n−1) th pin → (n + 2) th pin → ... Set pin numbers alternately in the left and right order. Next, in step 305, step 3
The presence or absence of the number of terminal pins set in 03 is detected. Here, the terminal pin “present” means that the terminal pin is normally inserted in the pin hole, and “absent” means that the terminal pin is not inserted.

If the terminal pin is “present” in step 305, step 3
Proceed to 07 to detect if the terminal pin "absent" was previously detected.
The reason why "previously terminal pin" absent? "" Is detected in step 307 is to detect a case where the terminal pin is misaligned as described below. That is, consider the case where the element 11 is inserted by being displaced by one step with respect to the pin hole as shown in FIG. That is, the element 11 should originally be mounted at the position indicated by the imaginary line 11 ', whereas the element 11 is mounted with the phase shifted by one row of pin holes. Therefore, in FIG. 4, the pin holes 17A and 17B are originally the pin holes into which the terminal pins n and n + 1 are to be inserted. In this case, the first time (pin hole
17A terminal pin presence / absence detection) and second time (pin hole 17B)
Detection of the presence or absence of the terminal pin), the terminal pin becomes “absent”. And the terminal pin becomes "exist" for the first time in the third time.
Therefore, the terminal pin “present” after the terminal pin “absent” can be detected as a mounting deviation error. That's step 30
This is the reason for detecting "previously detected" no "?" In 7.

If there is no terminal pin “none” previously in step 307, that is, if the “answer” in step 307 is NO, step 309
Go to and count up. It is detected in step 311 whether or not the count number in step 309 is larger than the registered maximum pin number (65 in the illustrated embodiment), and if NO, step 303
Return to and repeat the above steps.

When the count number exceeds the maximum registered pin number in step 311, it is detected as an error.

If the terminal pin is detected as "absent" in step 305, it is confirmed whether or not it is the final pin (step 31).
3). This confirmation can be performed by checking whether the number (total number) counted in step 309 matches any of the registered pin numbers. That is, it can be considered that the terminal pin is correctly inserted only when the total number of detected pins matches any of the registered pin numbers when the terminal pin is detected as “absent” in step 305 ( However, it is necessary to go through the steps described below to finally determine "normal".

On the contrary, if the total number of terminal pins does not match any of the registered pin numbers in step 313, an error occurs.

If it is confirmed in step 313 that the pin is the final pin, the process proceeds to step 315, in which it is confirmed whether or not it is pin 0 (no mounting) (the same printed circuit board may not insert the element depending on the type, It should be detected as normal). To confirm 0 pin, the total number of count pins is 0
Whether or not it can be easily determined.

However, the pin 0 is finally confirmed as the pin 0 only when the terminal pin “absent” is detected six times in a row (step 317). This is because it has been confirmed from experience that mounting deviations of three or more pairs of terminal pins are not present. Therefore, it can be distinguished from the case where the terminal pin “absent” continues due to mounting deviation.

If the terminal pin “none” does not continue for 6 consecutive times, step
Return to 303 and repeat the above operation.

When the normal test is completed for the normal device when the mounting is not 0, the total number of pin detections matches any of the registered pin numbers (step
313), and thereafter, only when the terminal pin “absent” is detected four times consecutively (for two pairs of terminal pins) (step 319). In this way, the reason why the process is terminated only after “absence” is detected a certain number of times is because, for example, there is a pin arrangement in which a pair of terminal pins are not mounted halfway. Therefore, the continuous number "4" is appropriately set according to the "missing" arrangement of the terminal pins (the terminal pins are not arranged continuously). However, if the number of consecutive times is increased, if there is an adjacent mounted element, the process directly shifts to the detection of the adjacent terminal pin, and the test will not be completed.

The processing speed can be increased if the number of terminal pins to be registered is set to the minimum necessary according to the type of element.
For example, in the case of the DIP type, the number of pins can be roughly classified into three types, 0 to 24, 28 to 42, and more. Therefore, only the required number of pins need be registered according to the device to be tested.

As described above, if the 0 mounting is detected as one mode of mounting instead of an error, the versatility of the operation program of the automatic device insertion machine can be achieved.

〔The invention's effect〕

As described above, the method of the present invention can be applied to both types of DIP and ZIP in exactly the same manner, and can surely detect regardless of the number of terminal pins. In addition, misaligned mounting can be detected reliably. Further, according to the present invention, the determination process is performed quickly, and the determination time per element is, for example, 1 ms or less.

[Brief description of drawings]

FIG. 1 is a diagram showing an example of an optical system for carrying out the present invention, FIG. 2 is a plan view showing an example of arrangement of terminal pins, and FIG.
FIG. 4 is a diagram showing an example of a flowchart for carrying out the method of the present invention, and FIG. 11 …… Element, 13 …… Terminal pin, 15 …… Printed board.

Claims (1)

[Claims] 1. A method for detecting the quality of insertion of terminal pins, which detects whether or not a plurality of terminal pins of an element are correctly inserted when they are inserted into corresponding pin holes of a printed board. The number of terminal pins of all elements is registered in advance, the presence or absence of the pin inserted in the corresponding pin hole of the printed board is detected, and the total number is compared with the registered pin number above, and the total number of pin detection is registered. Good or bad of terminal pin insertion, characterized by terminating normal test of normal device when it is not zero mounting when terminal pin "absent" is detected even number of times in succession after matching with any of the number of pins. Detection method.